In a large bowl, whisk together the flour, sugar, baking powder, baking soda, and salt.
In another bowl, combine buttermilk, egg, and melted butter.
Pour the wet ingredients into the dry ingredients and mix until just combined.
Preheat a non-stick skillet over medium heat and lightly grease it.
Pour small amounts of batter (about 2 tablespoons) onto the skillet.
Cook until bubbles form on the surface, about 2-3 minutes.
Flip the pancakes and cook for another 1-2 minutes until golden brown.
Repeat with the remaining batter, greasing the skillet as needed.
Stack pancakes on a plate and keep warm in the oven if desired.
Serve immediately with your choice of toppings.